7 - Oxidation, reduction and redox reactions

Question 1

What is the oxidation state for an uncombined element?

Answer 1

0

Question 2

What do oxidation states in a molecule sum to?

Answer 2

0

Question 3

What is the oxidation state of a monoatomic ion equal to?

Answer 3

Its charge

Question 4

What is equal to the sum of oxidation states of a polyatomic ion?

Answer 4

Charge

Question 5

What is the oxidation state of a Group 2 metal?

Answer 5

+2

Question 6

What is the oxidation state of a Group 1 metal?

Answer 6

+1

Question 7

What is Fluorine’s oxidation state?

Answer 7

-1

Question 8

What is Aluminium’s oxidation state? And when?

Answer 8

+3

Question 9

Describe Oxygen’s oxidation states?

Answer 9

-2
Unless in peroxides such as H2O2 –> -1
Unless in compounds with fluorine

Question 10

Describe the oxidation states of Br, Cl and I?

Answer 10

-1
Unless in a compound with Fluorine or Oxygen

Question 11

Describe Hydrogen’s oxidation states?

Answer 11

+1
Unless in a metal hydride (NaH) –> -1

Question 12

If an ion’s oxidation state decreases, what has happened to it?

Answer 12

It has been reduced

Question 13

If an ion has been oxidised, what happens to its oxidation state?

Answer 13

Increases

Question 14

What is an oxidising agent?

Answer 14

Electron acceptor

Question 15

What is a reducing agent?

Answer 15

Electron donor